全文获取类型
收费全文 | 18967篇 |
免费 | 876篇 |
国内免费 | 15篇 |
专业分类
19858篇 |
出版年
2021年 | 155篇 |
2020年 | 256篇 |
2019年 | 282篇 |
2018年 | 409篇 |
2017年 | 412篇 |
2016年 | 438篇 |
2015年 | 326篇 |
2014年 | 357篇 |
2013年 | 1549篇 |
2012年 | 680篇 |
2011年 | 734篇 |
2010年 | 432篇 |
2009年 | 414篇 |
2008年 | 549篇 |
2007年 | 537篇 |
2006年 | 458篇 |
2005年 | 404篇 |
2004年 | 406篇 |
2003年 | 386篇 |
2002年 | 400篇 |
2001年 | 733篇 |
2000年 | 729篇 |
1999年 | 494篇 |
1998年 | 214篇 |
1997年 | 206篇 |
1996年 | 165篇 |
1995年 | 159篇 |
1993年 | 160篇 |
1992年 | 382篇 |
1991年 | 347篇 |
1990年 | 365篇 |
1989年 | 356篇 |
1988年 | 338篇 |
1987年 | 306篇 |
1986年 | 328篇 |
1985年 | 324篇 |
1984年 | 256篇 |
1983年 | 223篇 |
1979年 | 209篇 |
1978年 | 177篇 |
1975年 | 199篇 |
1974年 | 251篇 |
1973年 | 217篇 |
1972年 | 209篇 |
1971年 | 172篇 |
1970年 | 158篇 |
1969年 | 200篇 |
1968年 | 212篇 |
1967年 | 167篇 |
1966年 | 186篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
22.
23.
24.
Anthony Dickinson 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1996,49(1):60-80
The role of within-compound associations in the retrospective revaluation of causality judgements was investigated in a two-stage procedure in which the subjects were asked to learn whether or not different food stimuli caused an allergic reaction in hypothetical patients. In the compound-cue stage a number of compound cues, each consisting of a competing stimulus and a target stimulus, were associated with the reaction across a series of trials, whereas in the single-cue stage the subjects had the opportunity to learn which of the competing cues, when presented alone, caused the reaction. Each target stimulus was presented with the same competing cue across all compound trials in the consistent condition, but with a different competing cue on each trial in the varied condition. In a forward procedure, in which the single-cue stage preceded compound cue training, judgements of the causal effectiveness of the target stimuli were reduced or blocked by training them in compound with a competing cue that had been previously paired with the reaction. Moreover, the magnitude of this reduction was comparable in the consistent and varied conditions. This was not true, however, when the single- and compound-cue stages were reversed in the backward procedure. Judgements for target cues compounded with competing cues that were subsequently paired with the reaction were reduced only in the consistent condition. If it is assumed that stronger associations were formed between the competing and target stimuli during the compound-cue stage in the consistent condition than in the varied condition, this pattern suggests that the retrospective revaluation of causality judgements can be mediated by the formation of within-compound associations. 相似文献
25.
26.
The purpose of this meta-analysis of randomized controlled trials was to evaluate the efficacy of psychological interventions for adults with noncancerous chronic low back pain (CLBP). The authors updated and expanded upon prior meta-analyses by using broad definitions of CLBP and psychological intervention, a broad data search strategy, and state-of-the-art data analysis techniques. All relevant controlled clinical trials meeting the inclusion criteria were identified primarily through a computer-aided literature search. Two independent reviewers screened abstracts and articles for inclusion criteria and extracted relevant data. Cohen's d effect sizes were calculated by using a random effects model. Outcomes included pain intensity, emotional functioning, physical functioning (pain interference or pain-specific disability, health-related quality of life), participant ratings of global improvement, health care utilization, health care provider visits, pain medications, and employment/disability compensation status. A total of 205 effect sizes from 22 studies were pooled in 34 analyses. Positive effects of psychological interventions, contrasted with various control groups, were noted for pain intensity, pain-related interference, health-related quality of life, and depression. Cognitive-behavioral and self-regulatory treatments were specifically found to be efficacious. Multidisciplinary approaches that included a psychological component, when compared with active control conditions, were also noted to have positive short-term effects on pain interference and positive long-term effects on return to work. The results demonstrated positive effects of psychological interventions for CLBP. The rigor of the methods used, as well as the results that reflect mild to moderate heterogeneity and minimal publication bias, suggest confidence in the conclusions of this review. 相似文献
27.
28.
Cardiovascular reactivity to video game and mental arithmetic stressors was compared among three groups of men: aerobically trained mild hypertensives, untrained mild hypertensives, and a comparison group of untrained normotensives. Relative to the untrained hypertensives, the trained hypertensives reacted to the video game with marginally smaller systolic blood pressure and diastolic blood pressure, but there were no significant differences between these groups in reactivity during the mental arithmetic task. Comparisons between each hypertensive group and the normotensive group showed that blood pressure (BP) reactivity of normotensives during the video game was generally similar to that of trained hypertensives but smaller than that of untrained hypertensives. These results indicate that aerobic training, which has been found to reduce resting BP in mild hypertensives, may also exert a favorable impact in reducing cardiovascular reactivity of hypertensives during some stressful situations. 相似文献
29.
30.
Although message‐production theories often assume that goals behave dynamically to direct communication behavior, few studies consider the interconnectedness of goals and behavior throughout interactions. Here, the interrelationship of communication goals and tactics was examined through a sequential analysis of 47 conflict interactions between close friends or dating partners. It was posited that for both the initiators and resistors in a conflict, the importance of relational or other‐identity goals would be associated with the use of integrative tactics and the importance of instrumental or self‐identity goals would be related to the use of distributive tactics. We examined these predictions within and across partners. Analyses indicated that for both conflict initiators and resistors, the importance of a combination self/instrumental goal predicted the use of distributive tactics and the importance of an other‐identity goal lead to partner‐oriented tactics. For resistors, the importance of an instrumental goal was associated with the use of distributive tactics and the importance of a combination identity/relational goal was aligned with issue‐oriented tactics as well. Across partners, several significant patterns between one partner’s use of distributive or integrative tactics and the other partner’s goals were observed. Implications of the results for understanding conflict and message production are discussed. 相似文献